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Does JavaScript have "Short-circuit" evaluation? Ask Question

tag-icon • tag-icon javascript short-circuiting
Does JavaScript have

I would like to know if JavaScript has "short-circuit" evaluation like &&-operator in C#. If not, I would like to know if there is a workaround that makes sense to adopt.

ベストアンサー1

Yes, JavaScript has "short-circuit" evaluation.

if (true || foo.foo){
    // Passes, no errors because foo isn't defined.
}

Live demo

if (false && foo.foo){
    // Also passes, no errors because foo isn't defined.
}

Live demo

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